<?php

declare(strict_types=1);

namespace App\Service;

use App\Form\Model\BookingDto;

/**
 * Extracts card display data for participants in card-based booking flows.
 *
 * Provides participant name, room assignment, and individual pricing for
 * display in the card overview UI.
 */
class ParticipantCardDataService
{
    public function __construct(
        private readonly BookingPriceCalculatorService $priceCalculator,
    ) {
    }

    /**
     * Get card data for a single participant.
     *
     * @return array{name: string, roomName: string, price: string}
     */
    public function getCardData(BookingDto $bookingDto, int $index): array
    {
        $participant = $bookingDto->participants[$index] ?? null;

        if (null === $participant) {
            throw new \InvalidArgumentException(sprintf('Participant at index %d does not exist', $index));
        }

        // Extract participant name with fallback
        $name = $this->getParticipantName($participant, $index);

        // Extract room name
        $roomName = $this->getRoomName($bookingDto, $participant);

        // Calculate and format individual price
        $price = $this->getFormattedPrice($bookingDto, $index);

        return [
            'name' => $name,
            'roomName' => $roomName,
            'price' => $price,
        ];
    }

    /**
     * Get card data for all participants.
     *
     * @return array<int, array{name: string, roomName: string, price: string}>
     */
    public function getAllCardsData(BookingDto $bookingDto): array
    {
        $cardsData = [];

        foreach ($bookingDto->participants as $index => $participant) {
            $cardsData[$index] = $this->getCardData($bookingDto, $index);
        }

        return $cardsData;
    }

    /**
     * Get participant name with fallback to generic label.
     */
    private function getParticipantName(object $participant, int $index): string
    {
        $firstName = $participant->firstName ?? '';
        $lastName = $participant->lastName ?? '';

        $name = trim($firstName.' '.$lastName);

        if ('' === $name) {
            return 0 === $index ? 'Anmelder:in' : sprintf('Teilnehmer:in %d', $index);
        }

        return $name;
    }

    /**
     * Get room name from travel model.
     */
    private function getRoomName(BookingDto $bookingDto, object $participant): string
    {
        $roomId = $participant->assignedRoomId ?? null;

        if (null === $roomId) {
            return 'Kein Zimmer zugewiesen';
        }

        $room = $bookingDto->travel->getRoomById($roomId);

        if (null === $room) {
            return 'Unbekanntes Zimmer';
        }

        return $room->label ?? 'Unbekanntes Zimmer';
    }

    /**
     * Calculate and format individual participant price.
     *
     * Returns a dash (-) when the price is zero and no room is assigned,
     * indicating incomplete configuration rather than a zero-cost booking.
     */
    private function getFormattedPrice(BookingDto $bookingDto, int $index): string
    {
        $prices = $this->priceCalculator->calculateAllParticipantIndividualPrices($bookingDto);

        $price = $prices[$index] ?? 0.0;

        // Display dash when price is zero and no room assigned (incomplete configuration)
        $participant = $bookingDto->participants[$index] ?? null;
        if (0.0 === $price && (null === $participant || null === $participant->assignedRoomId)) {
            return '-';
        }

        return number_format($price, 2, ',', '.').' €';
    }
}